Control structure of supporting foot for collapsible furniture

ABSTRACT

A control structure of supporting foot for collapsible furniture comprises a base having a rotation shaft fixed on a supporting foot. A concave hole is formed in the base and an extension shaft of the rotation shaft is combined with a spring and a sleeve. When the supporting foot is rotated to a predetermined position where the sleeve aims exactly at the concave hole of the base, the sleeve is pushed into the hole by the spring to fix and unfold the supporting foot. On the contrary, when the sleeve is pulled out of the hole, the supporting foot is free flow for getting folded and closed together with the furniture body by relative rotation.

FIELD OF THE INVENTION

[0001] This invention relates to a control structure of supporting foot for collapsible furniture, and more particularly, it relates to a rotatable and fixable control structure provided to a supporting foot of collapsible furniture for an easy folding or unfolding of the supporting foot.

BACKGROUND OF THE INVENTION

[0002] Whereas some collapsible furniture available in market may not be offered with fixing design for its supporting foot or feet, while some others which do have said fixing design are complained of its complexity in construction and inconvenience in operation, this invention is therefore proposed to improve or eliminate the drawbacks found in the prior arts.

SUMMARY OF THE INVENTION

[0003] The primary object of this invention is to provide a control structure of supporting foot for collapsible furniture by combining a rotation shaft to a base fixed on a furniture body, in which the supporting foot is fixed by the rotation shaft, and a resilient sleeve is provided to the rotation shaft. When the sleeve is pulled to depart from a concave hole in the base, the supporting foot is allowed to rotate freely, or on the contrary, the sleeve will slip into the concave hole automatically to thereby fix the supporting foot when the supporting foot is rotated to turn the sleeve to a corresponding position to the concave hole.

[0004] Therefore, basing on the abovesaid, a control structure of supporting foot for collapsible furniture is formed by disposing a base to the furniture body and a rotation shaft movably to the base, in which a supporting foot is fixedly arranged on the rotation shaft. A concave hole is formed in the base while a spring and a sleeve are combinedly disposed on an extension shaft of the rotation shaft such that when the supporting foot is rotated to have the sleeve positioned exactly aiming at the concave hole of the base, the sleeve would be pushed into the hole by the spring to hence fix the supporting foot at place. On the contrary, when the sleeve is pulled out of the hole, the supporting foot is released to rotate freely such that the supporting foot might be rotated relatively to the furniture body to be folded and closed.

[0005] For more detailed information regarding advantages or features of this invention, at least an example of preferred embodiment will be fully described below with reference to the annexed drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The related drawings in connection with the detailed description of this invention to be made later are described briefly as follows, in which:

[0007]FIG. 1 shows an embodiment of supporting foot of this invention applied to a table standing normally in three dimensions;

[0008]FIG. 2 shows the folded state of supporting foot of this invention applied to a table lying upside down in three dimensions;

[0009]FIG. 3 shows the unfolded state of supporting foot of this invention applied to a table lying upside down in three dimensions;

[0010]FIG. 4 is a lateral view showing the folding state of a supporting foot controlled by this invention; and

[0011]FIG. 5 is a lateral view showing the unfolding state of the supporting foot controlled by this invention.

DETAILED DESCRIPTION OF THE INVENTION

[0012]FIG. 1 shows the state that a supporting foot 5 on both sides of collapsible furniture is unfolded to support a furniture body.

[0013]FIG. 2 shows the state that the supporting foot 5 of collapsible furniture is folded and the furniture body is laid inversely.

[0014]FIG. 3 shows the unfolded state of the supporting foot 5 shown in FIG. 2.

[0015] As shown in FIGS. 3 and 4, a control structure 1 of this invention comprises a fixedly disposed base 21 on both respective corresponding sides of the bottom face of a furniture body 2—for example, a table. On each base 21, a concave hole 210 having a vertical groove 211 in its lateral wall is formed.

[0016] A shaft hole is arranged in the horizontal direction of the base 21, and a rotation shaft 12 is penetratingly disposed in the shaft hole such that the rotation shaft 12 can be rotated relatively to the base 21. The rotation shaft 12 is provided with an extension shaft 121 perpendicular to the shaft 12, in which the extension shaft 121 would be rotated within an angular range at both ends of the groove 211 when the rotation shaft 12 is rotated relatively to the base 21.

[0017] The rotation shaft 12 is soldered to joint with the supporting foot 5 of the furniture body 2. In an embodiment of this invention, the supporting foot 5 is H-shaped such that a transverse beam thereof can be pivotally jointed to a second link 4 that is in turn axially jointed to a first link 3 that is finally axially jointed to the furniture body 2. When the supporting foot 5 is unfolded, both the first and the second link 3/4 would serve for reinforcement rods to support the supporting foot 5 (as indicated in FIG. 3). On the contrary, those first and second links 3/4 are supposed to rotate to approach each other and contact the furniture body 2 when the supporting foot 5 is relatively folded to the furniture body 2 (as indicated in FIG. 2).

[0018] This invention provides a sleeve 11 to the extension shaft 121, which is combined to the rotation shaft 12. The sleeve 11 has an outer diameter shorter than the calibration of the concave hole 210 and has an inner space with a bottom portion provided with a hole for the extension shaft 121 to penetrate, in which the inner diameter at the top end of the inner space is larger than the diameter of the extension shaft 121. After the extension shaft 121 has penetrated through both the hole at the bottom portion and the inner space of the sleeve 11, it then wears a spring 13 in its inner space in the manner that one end of the spring 13 would contact the bottom end of the inner space of the sleeve 11. Then, a washer 14 is provided and locked to the end of the extension shaft 121 under cooperation of the spring 13, and meanwhile to resist the spring in a contrary viewpoint. A restoring force of the spring 13 applied on the sleeve 11 pulls the latter to tend to approach the rotation shaft 12.

[0019] Referring to FIG. 4, when the sleeve 11 is pulled to depart from the concave hole 210, the supporting foot 5 will be rotated around the rotation shaft 12 and go further to the furniture body 2 to get even folded since there is no bondage made to the rotation shaft 12. During the rotating process of the rotation shaft 12, the extension shaft 121 is supposed to be rotated in the groove 211, and the lower end of the sleeve 11 always keeps in touch with the outer surface of the base 21 and moves along that surface due to the pressure of the spring 13.

[0020] The time the rotation shaft 12 is centered for the supporting foot 5 to rotate about for unfolding itself until a predetermined angle is achieved such that the sleeve 11 is aiming at the concave hole 210 of the furniture body 2 exactly, the sleeve 11 is pushed by the spring 13 then and there to be inserted in the concave hole 210 to have the supporting foot fixed in the base 21 (as shown in FIG. 5). Meantime, both the first and the second link 3/4 are thoroughly straightened for reinforcement of the supporting foot 5.

[0021] In the above described, at least one preferred embodiment has been described in detail with reference to the drawings annexed, and it is apparent that numerous variations or modifications may be made without departing from the true spirit and scope thereof, as set forth in the claims below. 

What is claimed is:
 1. A control structure of supporting foot for collapsible furniture, comprising: a base fixed at a furniture body, having a concave hole; a rotation shaft disposed on said base, in which at least a supporting foot is fixed at said rotation shaft, and said rotation shaft can be relatively rotated to said base; a sleeve having an outer diameter shorter than the diameter of said concave hole; and a spring being arranged between said sleeve and rotation shaft, and said sleeve being offered with a power for approaching said rotation shaft under assistance of the restoring force of said spring.
 2. The control structure according to claim 1, in which a groove is formed in a lateral wall of said concave hole; and an extension shaft is perpendicularly arranged on said rotation shaft such that the extension shaft would rotate in the angular range between those two ends of said groove when said rotation shaft is rotated relatively to said base.
 3. The control structure according to claim 2, in which said sleeve has an inner space; said extension shaft penetrates through said inner space; said spring is collared on said extension shaft and is accommodated in the inner space of said sleeve in the manner that one end of said spring contacts the bottom end of the inner space of said sleeve; and a washer is arranged on said extension shaft for blocking said spring. 